Hello Dan and welcome to the forum. From the single not very good pic you have posted they are circa Great war in date, perhaps a little bit earlier. Before you ask, in case you wondered, they do not have much value to them, though the case is perhaps a bit more valuable, if it is WD arrow marked and dated or perhaps named and unit marked as well. Many of this type of bino's that you see are French made and were impressed into allied use during a time of shortage. they also appear to probably be missing some screw on lens cups.